Ballistically, I think you'll find the two powders so close together that using one at the range and the other in the deer stand just makes sense. In the field you want a carefree reload. BH gives you that. Plus, it's as close to weatherproof as you can get. Not so with T7.
Honestly, I think you will find your sweet spot with BH somewhere between 100 and 110 grains by volume Rustic. The money spent on the BH is simply a very good insurance policy, but be sure you are using shotshell reloading primers, not the muzzleloader primers. Winchester 209, CCI and Federal 209A are great primers to use when hunting. I use Winchester 209 primers.
At the club I shoot T7 fffg granulation, same charge weight as the bh 209 in each of the three guns I hunt with and they shoot identical to the same weighed charge of BH 209. I will not hunt with T7, period.